- NAME
- SYNOPSIS
- DESCRIPTION
- ABSTRACT
- REQUIREMENT
- PUBLIC METHODS
  - new HASH_OPTIONS
  - export_sql FILENAME
- PUBLIC METHODS
  - _init HASH_OPTIONS
  - _tables
  - _get_sql_data
  - _sql_type INTERNAL_TYPE LENGTH
  - _column_info TABLE
  - _primary_key TABLE
  - _unique_key TABLE
  - _foreign_key TABLE
  - _get_privilege
- AUTHOR
- COPYRIGHT
- BUGS
- SEE ALSO

# NAME

Ora2Pg - Oracle to PostgreSQL database schema converter

# SYNOPSIS

            BEGIN {
                    $ENV{ORACLE_HOME} = '/usr/local/oracle/oracle816';
            }

            use strict;

            use Ora2Pg;

            # Init the database connection
            my $dbsrc = 'dbi:Oracle:host=testdb.samse.fr;sid=TEST;port=1521';
            my $dbuser = 'system';
            my $dbpwd = 'manager';

            # Create an instance of the Ora2Pg perl module
            my $schema = new Ora2Pg (
                    datasource => $dbsrc,           # Database DBD datasource
                    user => $dbuser,                # Database user
                    password => $dbpwd,             # Database password
            );

            # Create the POSTGRESQL representation of all objects in the database
            $schema->export_schema("output.sql");

            exit(0);

# DESCRIPTION

Ora2Pg is a perl OO module used to export an Oracle database schema to a PostgreSQL compatible schema.

It simply connect to your Oracle database, extract its structure and generate a SQL script that you can load into your PostgreSQL database.

I'm not a Oracle DBA so I don't really know something about its internal structure so you may find some incorrect things. Please tell me what is wrong and what can be better.

It currently only dump the database schema, with primary, unique and foreign keys. I've tried to excluded internal system tables but perhaps not enougt, please let me know.

# ABSTRACT

The goal of the Ora2Pg perl module is to cover all part needed to export an Oracle database to a PostgreSQL database without other thing that provide the connection parameters to the Oracle database.

Features must include:

            - database schema export (done)
            - grant export (done)
            - predefined function/trigger export (todo)
            - data export (todo)
            - sql query converter (todo)

My knowledge regarding database is really poor especially for Oracle so contribution is welcome.

# REQUIREMENT

You just need the DBI and DBD::Oracle perl module to be installed

# PUBLIC METHODS

## new HASH_OPTIONS

Creates a new Ora2Pg object.

Supported options are:

            - datasource    : DBD datasource (required)
            - user          : DBD user (optional with public access)
            - password      : DBD password (optional with public access)

Attempt that this list should grow a little more because all initialization is done by this way.

## export_sql FILENAME

Print SQL conversion output to a filename or to STDOUT if no file is given.

# PUBLIC METHODS

## _init HASH_OPTIONS

Initialize a Ora2Pg object instance with a connexion to the Oracle database.

## _tables

This function is used to retrieve all table information.

Set the main hash of the database structure $self->{tables}. Keys are the names of all tables retrieved from the current database. Each table information compose an array associated to the table_info key as array reference. In other way:

        $self->{tables}{$class_name}{table_info} = [(OWNER,TYPE)];

TYPE Can be TABLE, VIEW, SYSTEM TABLE, GLOBAL TEMPORARY, LOCAL TEMPORARY, ALIAS, SYNONYM or a data source specific type identifier.

It also get the following informations in the DBI object to affect the main hash of the database structure :

        $self->{tables}{$class_name}{field_name} = $sth->{NAME};
        $self->{tables}{$class_name}{field_type} = $sth->{TYPE};

It also call these other private subroutine to affect the main hash of the database structure :

        @{$self->{tables}{$class_name}{column_info}} = &_column_info($self, $class_name);
        @{$self->{tables}{$class_name}{primary_key}} = &_primary_key($self, $class_name);
        @{$self->{tables}{$class_name}{unique_key}}  = &_unique_key($self, $class_name);
        @{$self->{tables}{$class_name}{foreign_key}} = &_foreign_key($self, $class_name);

## _get_sql_data

Returns a string containing the entire SQL Schema definition compatible with PostgreSQL

## _sql_type INTERNAL_TYPE LENGTH

This function return the PostgreSQL datatype corresponding to the Oracle internal type.

## _column_info TABLE

This function implements a Oracle-native column information.

Return a list of array reference containing the following informations for each column the given a table

[( column name, column type, column length, nullable column, default value )]

## _primary_key TABLE

This function implements a Oracle-native primary key column information.

Return a list of all column name defined as primary key for the given table.

## _unique_key TABLE

This function implements a Oracle-native unique key column information.

Return a list of all column name defined as unique key for the given table.

## _foreign_key TABLE

This function implements a Oracle-native foreign key reference information.

Return a list of hash of hash of array reference. Ouuf! Nothing very difficult. The first hash is composed of all foreign key name. The second hash just have two key known as 'local' and remote' corresponding to the local table where the foreign key is defined and the remote table where the key refer.

The foreign key name is composed as follow:

        'local_table_name->remote_table_name'

Foreign key data consist in two array representing at the same indice the local field and the remote field where the first one refer to the second. Just like this:

        @{$link{$fkey_name}{local}} = @local_columns;
        @{$link{$fkey_name}{remote}} = @remote_columns;

## _get_privilege

This function implements a Oracle-native tables grants information.

Return a hash of all groups (roles) with associated users and a hash of arrays of all grants on related tables.

# AUTHOR

Gilles Darold <gilles@darold.net>

# COPYRIGHT

Copyright (c) 2001 Gilles Darold - All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

# BUGS

This perl module is in the same state as my knowledge regarding database, it can move and not be compatible with older version so I will do my best to give you official support for Ora2Pg. Your volontee to help construct it and your contribution are welcome.

# SEE ALSO

DBI, DBD::Oracle